自定义cell代理的用法

首先我们先得定义一个cell。.h文件如下：

 @protocol MycellDelegate

 @optional
 -(void)didClickButton:(UIButton *)button;

 @end

 @interface Mycell : UITableViewCell

 +(instancetype)cellWithtableView:(UITableView *)tableview;

 @property(nonatomic,strong)DateModel *model;

 @property(nonatomic,weak) id delegate;

.m文件如下：

 #import "Mycell.h"

 @interface Mycell()

 @property(nonatomic,strong)UIButton *button;

 @end

 @implementation Mycell

 +(instancetype)cellWithtableView:(UITableView *)tableview
 {
     static NSString *ID = @"cell";
     Mycell *cell = [tableview dequeueReusableCellWithIdentifier:ID];
     if(!cell)
     {
         cell = [[Mycell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:ID];
         cell.selectionStyle = UITableViewCellSelectionStyleNone;
         cell.textLabel.font = [UIFont systemFontOfSize:13.0];
     }
     return cell;

 }


 //重写布局
 -(instancetype)initWithStyle:(UITableViewCellStyle)style reuseIdentifier:(NSString *)reuseIdentifier
 {
     self = [super initWithStyle:style reuseIdentifier:reuseIdentifier];
     if(self)
     {
         self.button = [[UIButton alloc] initWithFrame:CGRectMake(0, 0, [UIScreen mainScreen].bounds.size.width, self.frame.size.height)];
         [self.button setTitle:@"我是按钮点我" forState:UIControlStateNormal];
         [self.button setTitleColor:[UIColor redColor] forState:UIControlStateNormal];
         self.button.contentHorizontalAlignment = UIControlContentHorizontalAlignmentRight;
         self.button.titleLabel.font = [UIFont systemFontOfSize:12.0];
         [self.contentView addSubview:self.button];
         [self.button addTarget:self action:@selector(btnClick:) forControlEvents:UIControlEventTouchUpInside];
     }
     return self;
 }


 //给cell控件赋值
 -(void)setModel:(DateModel *)model
 {
     self.textLabel.text = [NSString stringWithFormat:@"日期:%@、信息:%@",model.date,model.message];

 }

 #pragma mark - 按钮点击事件，通过代理模式响应
 -(void)btnClick:(UIButton *)btn
 {
     [self.delegate didClickButton:btn];
 }

 @end

上述代码定义了一个代理，当按下按钮时，代理响应。

现在回到UItableviewController，代码如下：

 -(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
 {
     Mycell *cell = [Mycell cellWithtableView:tableView];
     cell.model = self.Array[indexPath.row];
     cell.delegate = self;
     return cell;
 }

别忘了.delegate = self哦！代理执行的代码如下：

 #pragma mark - 代理事件
 //跳转到下一界面并传值
 -(void)didClickButton:(UIButton *)button
 {
     Mycell *cell = (Mycell *)button.superview.superview;
     NSIndexPath *indexPath = [self.tableView indexPathForCell:cell];
     MessageController *vc = [[MessageController alloc]init];
     DateModel *model = self.Array[indexPath.row];
     vc.message = [NSString stringWithFormat:@"行号:第%ld行，日期:%@、信息:%@",(long)indexPath.row,model.date,model.message];
     [self.navigationController pushViewController:vc animated:YES];
 }